Very Computer

i'm porting an application bulid on a ARM processor running on 36Mhz on to
a
i486 machine at 66MHz. But it seen that the application has run at a very
slow speed compare with a 36Mhz processor.

the system show that it is using it's full CPU time on the process. What
could be the problem?

thanks for all replys

Quote:> hi to all
> i'm porting an application bulid on a ARM processor running on 36Mhz on to
> a
> i486 machine at 66MHz. But it seen that the application has run at a very
> slow speed compare with a 36Mhz processor.
> the system show that it is using it's full CPU time on the process. What
> could be the problem?

RISC are faster. They tend to run on fixed instruction word length and each
instruction normally takes the same amount of time. (The idea RISC chip
should manage each instruction in one clock cycle).

CISC may take 10 clock cycles to complete a complex instruction, so a 66Mhz
486 may be the equivalent of a 6.6Mhz ARM.

(A bit over-simplified, but that's the general idea)

No. I'll respond to the group. IF you can't be bothered to read it....
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: i'm porting an application bulid on a ARM processor running on 36Mhz on to
: a
: i486 machine at 66MHz. But it seen that the application has run at a very
: slow speed compare with a 36Mhz processor.

: the system show that it is using it's full CPU time on the process. What
: could be the problem?

1) A 486/66 isn't very fast. Probably a 36Mhz ARM is faster, though I've
no personal experience with an ARM.

2) Another possibility is maybe the 486 has more memory than it can cache?
That's a well-known way to sink performance way down the drain.

3) Perhaps you need to push the "turbo" switch?

Fred

--

   "For the word of God is living and active. Sharper than any double-edged
   sword, it penetrates even to dividing soul and spirit, joints and marrow;
              it judges the thoughts and attitudes of the heart."  
---------------------------- Hebrews 4:12 (niv) ------------------------------

: i'm porting an application bulid on a ARM processor running on 36Mhz on to
: a
: i486 machine at 66MHz. But it seen that the application has run at a very
: slow speed compare with a 36Mhz processor.

: the system show that it is using it's full CPU time on the process. What
: could be the problem?

Intel architecture.

It is crap. And ARM is more-or-less reasonable RISC architecture.

I've once compared 120MHz Pentium with 25Mhz Sparc, and Sparc
outperforms. But that time there was other handicaps of Intel - it has
IDE drives and Windows NT OS, compared with SCSI and Solaris 2.5 on
Sparc.
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